<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>提交示例</title>
</head>

<body>
    <h2>hello word</h2>
</body>
<style>
    h2 {
        font-size: 30;
        color: rgb(0, 0, 0);
        background-color: pink;
        border: 1px solid black;
        width: 200px;
        text-align: center;

    }
</style>

</html>